/*
 * libjingle
 * Copyright 2004 Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
#define TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_

#ifdef HAVE_WEBRTC_VIDEO

#include <string>
#include <vector>

#include "talk/media/base/videocapturer.h"
#include "talk/media/webrtc/webrtcvideoframe.h"
#include "webrtc/base/asyncinvoker.h"
#include "webrtc/base/messagehandler.h"
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/common_video/libyuv/include/webrtc_libyuv.h"
#include "webrtc/modules/video_capture/include/video_capture.h"

namespace cricket {
    
    // Factory to allow injection of a VCM impl into WebRtcVideoCapturer.
    // DeviceInfos do not have a Release() and therefore need an explicit Destroy().
    class WebRtcVcmFactoryInterface {
    public:
        virtual ~WebRtcVcmFactoryInterface() {}
        virtual webrtc::VideoCaptureModule* Create(
                                                   int id, const char* device) = 0;
        virtual webrtc::VideoCaptureModule::DeviceInfo* CreateDeviceInfo(int id) = 0;
        virtual void DestroyDeviceInfo(
                                       webrtc::VideoCaptureModule::DeviceInfo* info) = 0;
    };
    
    // WebRTC-based implementation of VideoCapturer.
    class WebRtcVideoCapturer : public VideoCapturer,
    public webrtc::VideoCaptureDataCallback {
    public:
        WebRtcVideoCapturer();
        explicit WebRtcVideoCapturer(WebRtcVcmFactoryInterface* factory);
        virtual ~WebRtcVideoCapturer();
        
        bool Init(const Device& device);
        bool Init(webrtc::VideoCaptureModule* module);
        
        // Override virtual methods of the parent class VideoCapturer.
        virtual bool GetBestCaptureFormat(const VideoFormat& desired,
                                          VideoFormat* best_format);
        virtual CaptureState Start(const VideoFormat& capture_format);
        virtual void Stop();
        virtual bool IsRunning();
        virtual bool IsScreencast() const { return false; }
        virtual bool SetApplyRotation(bool enable);
        
    protected:
        // Override virtual methods of the parent class VideoCapturer.
        virtual bool GetPreferredFourccs(std::vector<uint32>* fourccs);
        
    private:
        // Callback when a frame is captured by camera.
        virtual void OnIncomingCapturedFrame(const int32_t id,
                                             const webrtc::VideoFrame& frame);
        virtual void OnCaptureDelayChanged(const int32_t id,
                                           const int32_t delay);
        
        // Used to signal captured frames on the same thread as invoked Start().
        // With WebRTC's current VideoCapturer implementations, this will mean a
        // thread hop, but in other implementations (e.g. Chrome) it will be called
        // directly from OnIncomingCapturedFrame.
        // TODO(tommi): Remove this workaround when we've updated the WebRTC capturers
        // to follow the same contract.
        void SignalFrameCapturedOnStartThread(const webrtc::VideoFrame frame);
        
        CaptureState StartOnCreateThread(const VideoFormat& capture_format);
        void StopOnCreateThread();
        
        rtc::scoped_ptr<WebRtcVcmFactoryInterface> factory_;
        webrtc::VideoCaptureModule* module_;
        int captured_frames_;
        std::vector<uint8_t> capture_buffer_;
        rtc::Thread* start_thread_;  // Set in Start(), unset in Stop();
        
        // Critical section to avoid Stop during an OnIncomingCapturedFrame callback.
        rtc::CriticalSection critical_section_stopping_;
        dispatch_group_t group_;
        
        rtc::scoped_ptr<rtc::AsyncInvoker> async_invoker_;
    };
    
    struct WebRtcCapturedFrame : public CapturedFrame {
    public:
        WebRtcCapturedFrame(const webrtc::VideoFrame& frame,
                            void* buffer,
                            size_t length);
    };
    
}  // namespace cricket

#endif  // HAVE_WEBRTC_VIDEO
#endif  // TALK_MEDIA_WEBRTCVIDEOCAPTURER_H_
